Improvement in sewing-machines



2 Sheets-,Sheetl 1:. J. GRAY'. 2 'Sewing Machine.

Patented May 17, 1859.

.1'. GRAY. sewing Machine..

2 SheGtsf-Sheet No. 24.022. Patented May 17, 1859;

UNITED STATES PATENT OFFICE.

JOSHUA GRAY, OF MEDFORD, MASSACHUSETTS.

y IMPROVEMENT IN "SEWING-MACHINES.

Specilication forming part of `Letters Patent No. 24,022, dated May 17, 1859.

letters of reference marked thereon. 1

My invention is upon that class of sewingmachines which form a double-looped stitch with two threads, and is designed to attainprecision and certainty of action with the greatest simplicity of mechanism; and it consists in certain details of construction, which will now be fully set forth and described. f

That others skilled in the, art may understand and use my invention, I will proceed to describe the manner in which I have carried out the same.

- In the drawings, Figure lis a plan of the under side of the machine. Fig. 2 is a side elevation of the machine,-and.Figs. 3, 4, and 5 details to be referred to hereinafter.

A represents the bed-plate of the machine, to the under side of which are secured tw'o short stands, B B, which serve as bearings for the shaft C. This shaft carries on one end the driving-pulleyD, which is operatedA from the treadle in the customary manner. A crank-pin, a, placed on the face of the wheel D, enters a slot,

' b, in a bent arm, E, which is pivotedat o, to

the frame of the machine, and is thus vibrated by the .revolution of the wheel D. This communicates a vertical motion to the needle-bar F, connected ina suitable manner to the other end of the arm E. A side bar, G, is pivoted at one end, at d, to the arm E, the other end playing in a suitable slot in a block, H, at-4 tached to the bed-plate. Thus the vibration of the arm E slides the bar G back and forth beneath the bed-plate. Abent lever, f, having a long arm, l, andashorter arm, 2, (see Fig. 3,) is pivoted at e'to the bar G, on the side next the bed-plate, and is vibrated at proper inter- Ivals, by the motions ofthe bar G, inthe following manner: An adjustable block or cam, I, is secured by a screw and slot at g, to the bedplate. The arin 1 of the lever f is held in contact with the edge 3 of the cam I by a spring, i', attached to the barG. Anotch, 5, in the edge 3,

receives a stud, 4, on the arm 1, and gives the 1eguiredthrow to the arm 2 of the lever f. This latter arm is bent up, as in Figs. l and 3,v toward the bed-plate, and carries at' its outer end a bentneedle or hook, h, which is secured to the arm 1by a screw, b. universally-adjustable stop (and guides) I, the throw of the lower hook is regulated at'pleas ure, and also the direction of its motion, as

may be deemed expedient in adjusting the machine for operation, or inreplacing the lower needle, h. A post, K, descending from the bedplate, is furnished with the ordinary screwnuts and spring for regulating the tension of the thread. It carries a spool, Z, the thread k from which (shown in red) is led through a hole, m, in the lever f, and thence through the eye of' the needle 71. Another thread, n, (in blue,) from a spool, o, is led through ahole in the top of the needle-bar F and down through the eye of the needle at the lower end of this bar.

The following is the device which I employ for feeding the goods and regulating the length of stitch: The presser-bar M, Fig. 2, being of the ordinary construction, need not be here described. A sliding bar, N, (detached in Fig.4,) is supported and vibrates longitudinally in two studs or blocks, q' and i', attached to the under side of the bed-plate, the slot in the block4 1 allowing the bar to rise and-fall toward and from the bed-plate. A spring, p, attached to this bar presses itfaway from the bed-plate.

The feeding-foot s is attached to this bar near the middle of its length, and projects through a suitable slot in the bed-plate. To the bar N is attached, near one end, an adjustable stop, t,

'a portion of which is bent down, and embraces I the bar at 7, and a screw, 8,'passing through a slot, 9, in the stop allows thestop to be moved longitudinally by means of a screw-nut, u, on the bar. The position of this stop regulates the distance to which the bar Nwill be vibrated, and consequently the length ofthe stitch. The longitudinal motions are given to the bar N by Van incline, 10, 011 the side of the bar G, striking against the end of the stop t, which moves the bar in the direction of the arrow, Fig 4, until arrested by the nut u, striking against the block q. Another incline, 11, on the opposite edge of the bar G, strikes as the bar is drawn back, against a pin, fu, on the bar N, and moves it inthe opposite direction. The foot s is By means of thev pressed 11p-through the slot in the bed-plate and against the under side of the goods (at the instant before the bar N is moved by the incline l0) by a wedge or incline, w, Fig. 2, attached to the slide G, which lifts the feed-bar against the resistance of the spring p.

It will be observed from the foregoing description of the construction ofl my improved machine that the greatest degree of 'certainty and perfection is induced by the least number of parts of simple construction and arrangement together.` The reciprocating bar G, it

' will be seen, operates directly both the feeding device and lower hook or needle mechanism, and is itself driven simply by the vibrating arm E, which operates the upper needle-bar.

rlhe operation of this machine is as follows: The upper needle descends through the goods and forms a loop, l, Fig. 5, through which the lower needle passes with the thread 7c. The upper needle ascends, andl after the cloth is fed passes down through the loop 2 of the lower needle. The latter is then withdrawn,

leaving its loop 2 around the upper needle, and before this needle is withdrawn the lower one is passed through its loop 3. The upper needle is then withdrawn and descends through the loop 4 of the lower needle, and the opera- The motion of Athe tion continues as before.

slide Gcarries the hole m in'thc lever f back past the line of the spool l, and draws up the slack of the thread k, in the same manner as the throw of the needle-bar F, above the line of the hole in the post L, draws up the slack of the thread n, thus dispensing with the use of springs for taking up the slack of either thread. n

Having describedthe construction and opcr ation of my improvement, what I claim as my invention, and desire to secure by Letters JOSHUA GRAY.

Vitnesses Tiros. R. Roncn, l?. E. TnscnmrAcHnn. 

